Electronic keyboard instrument



FIG. 1 is a front, top, right perspective view of an electronic keyboard instrument showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a back elevation view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for an electronic keyboard instrument, as shown and described. 